Masonry chipping machine



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3mm 7Z/0MA sh. LARSEN.

. 2 Sheets-Sheet 2 T. H. LARSEN Filed April 13, 1942 MASONRY CHIPPING MACHINE fT/G 65 7210/495 H. LHESE/V.

FLOOE LINE J April 20, 1943.

Patented Apr. 20, 1943 UNITED STATES PATENT OFFICE MASONRY OHIPPJNG MACHINE Thomas H. Larsen, Washington, D. C.

Application April 13, 1942, Serial No. 438.684

Claims.

This invention refers to masonry chipping machines and more particularly to a machine of this type that will chip holes in concrete and various types of petrous bases on which composition coatings, plastic ceilings, or floorings are to be spread and keyed to. It has among its objects to provide a machine of this nature that will do this kind ofwork efiectively over a comparatively large area; will do same uniformly and quickly; that will have a construction that will permit easy access to its moving and operating parts; and which may be directed to operate in various planes and at variable angles; also to operate a large number of chisels at one time. Other objects will become apparent as the invention is more fully set forth.

The machine embodying this invention consists of a suitable number of drills or chisels, or tools, operable at the same time and travelling in unison or simultaneously intermittently in relation to each other. The chisels operate on holders that have kick plates attached to them, which in turn are struck with revolving hammers actuated by a single source of power through suitable connecting mechanism. The device is portable and capable of being swung to operate atvarious angles to suit surfaces positioned below, above, or at its sides, without requiring any substantial realignment or changing of the parts or mechanism of the machine.

In the drawings which indicate an embodiment of this invention:

Figure 1 is a plan View of a machine embodying this invention with the tools arranged for roughening and keying a surface above the machine,

Figure 2 is a side elevation of the machine shown in Figure 1,

Figure 3 is an end elevation of Figure 2, and

Figure 4 is a section through Figure 1, along the line 44, with the chisels or tools arranged for a surface below the machine.

Similar reference characters refer to similar parts throughout the drawings.

In the drawings 1 represents the frame of the device which consists of two wall plates 2 and 3 respectively, connected together with end member 4. The frame is provided with undercarriages 5 at each corner, that permit the machine to be easily moved about the room where it is to be used. The elevating elements 6 of the frame extend above and support an axle I which is arranged with gears 8 that operate to turn a chisel carriage 9 through an arc of travel of 180 as indicated in Figures 2 and 3. This enables the tools, chisels, or drills to be operated in an angular position within such limits, which include a vertically upward chiselling (see Figure 1), a vertically downward chiselling (see Figure 3), and angular chiselling (see Figure 2), as selected.

The handle I0 is provided to manually permit this, and pawl H keeps the carriage set in the position to which it is rotated. The elevating elements are raised and lowered in the sides of the frame I, through the use of gear racks I2, and pinions l3, mounted on a shaft I4, journalled in the frame I, and rotated with a handle I5. A stop l6 sets the racks at the selected position so they will not move away from same while the device is being operated. The elevating elements raise the rectangular carriage 9 having a series of plungers ll, which pass through guide holes H3, in one side 39 of the carriage and terminate in cylinders IS on another side 38 opposite. The plungers are provided with kick plates 20 which serve the double purpose of taking the blows from the rotating hammer heads 2|, and supporting the compression springs 22. Collars 23 are adjustably attached to the plungers and serve to limit the outward travel of the plungers while striking, as indicated. The lower portions of the plungers are arranged with tool or chisel holders 24, which are held in place with tapered pins 25.

The tools, chisels, or drills have preferably flattened shanks 26, and are held in place with set screws 21. The collars have springs 28, which support the weight of the plungers and chisels and tend to keep the points 29 off the surface to be chiselled, when the machine is not operating.

The hammer heads 2| are mounted on revolving arms 3| and held to same by the pins 39 which permit the circular hammerheads to turn around of their own accord, and thereby present variable striking surfaces against the kick plates. The arms are provided in pairs so that every revolution will cause-more than one hammer head to strike the kickplates and lift the plungers.

These arms are mounted on shafts 32 which revolve through the connection of various gears 33 to one another, all being mounted on the carriage in a suitable manner. A motor 34 in the carriage and suitably connected up, serves to r0 tate the various gears 33 through a transmission chain, and thereby revolve the arms 3! with their hammer heads. These hammer heads strike the kickplates on the outer rows of plungers and these kickplates, in turn, raise or strike the inner plunger kickplates so that all the plungers operate together, and without tending to bind.

In the operation of the device, the machine is brought adjacent the surface to be given a roughened appearance for keying purposes. The handle I0 is turned until the chisel or tool carriage 9 is brought adjacent thereto. The handle I5 is used to bring the chisels to the proper elevation for striking the surface. The chisels or tools are adjusted properly, and then the motor is started.

As the latter revolves the gears 33, the arms 3| are in turn rotated and their hammerheads strike against the kickplate, causing same to rise and permitting the hammerheads to continue in their revolutions. As the hammerheadspass the kickplates, the latter, under the tension of springs 22, force the plungers down and thereby cause their chisel points to stroke and chip the wall or floor surface against which they are pointed.

A moment later, the second hammerheads similarly strike the kickplates and cause the chisels to strike again. The operation of the hammerheads, the use of the springs and the inertia and dynamic action of the plungers and their parts, give the chisels a striking action and rebound that is particularly suitable for the work to be done and the operation of the machine. The eneral positioning of the parts of the machine has already been explained, and provides all general adjustments to suit the work to be done, no matter whether placed above, below, or at the sides of the machine.

While but one form of the invention is shown in the drawings, it is not desired to limit this application for patent to this particular construction, except limited by the prior art, as it is appreciated that other forms could be made that would use the same principles and come within the scope of the appended claims. 7

laving thus described the invention, I claim:

1. A machine of the class describedcon prising in combination, a frame, a tool carriage mounted on the frame, a plurality of plungers mounted on the carriage and reciprocable therein, a mechanism for operating the plungers, cutting tools secured to the plungers forroughening and keying surfaces struck thereby, means on the plungers and casing for allowing the plungers and tools to rebound resiliently, means for tilting the carriage in the frame for operating the tools in divers planes and directions, a plurality of kickpiates mounted on the plungers, and a plurality of hainmerheads actuated by said mechanism for striking the kickplate s and causing the plungers and tools thereon to reciprocate against surfaces to be roughenedand keyed.

2. A machine of the class described, comprising in combination a frame having its Walls spaced to provide'an opening at one side thereof, a plurality of elevating elements mounted on the walls, means for adjusting the position of the said elevating elements, an axle mounted on the elements and adapted to be positioned thereby, a tool carriage rotatively mounted on the axle and adapted to be swung on an are through the said opening and operatively held in any portion of the arc, a plurality of plungers operating and held in the carriage, a plurality of tools attached to the plungers and projecting therefrom for contacting surfaces to be roughened and keyed thereby, kick plates mounted securely on the plungers and coacting with each other, and means for striking the kick plates and causing them to reciprocate with their plungers and tools.

3. A machine of the class described, comprising in combination a frame having its walls spaced to provide an opening at one side thereof, a plurality of elevating elements mounted on the walls, means for adjusting the position. of

the said elevating elements, an axle mounted on the elements and adapted to be positioned thereby, a tool carriage rotatively mounted on the axle and adapted to be swung on an are through the said opening and operatively held in any portion of the arc, a plurality of plungers operating and held in the carriage, a plurality of tools attached to the plungers and projecting therefrom for contacting surfaces to be roughened and keyed thereby, kick plates mounted securely on the plungers and coacting with each other, means for striking the kick plates and causing them to reciprocate with their plungers and tools, and resilient means mounted on the tool carriage for tensioning the plungers and their tools.

4. A machine of the class described, comprising in combination a frame having its walls spaced to provide an opening at one side thereof, a plurality of elevating elements mounted on the walls, means for adjusting the position of the said elevating elements, an axle mounted on the elements and adapted to be positioned thereby, a tool carriage rotatively mounted on the axle and adapted to be swung on an arc through the said opening and operatively held in any portion of the arc, a plurality of plungers operating and held in the carriage, a plurality of tools attached to the plungers and projecting therefrom for contacting surfaces to be roughened and keyed thereby, kick plates mounted securely on the plungers and coacting with each other, means for striking the kick plates and causing them to reciprocate with their plungers and tools, resilient means mounted on the tool carriage for tensioning the plungers and their tools, and undercarriages for the frame for carrying the same and adjusting the tools on the surface to be roughened and keyed.

5. A machine of the class described, comprising in combination a frame having its Walls spaced to provide an opening at one side thereof, a plurality of elevating elements mounted on the walls, means for adjusting the position of the said elevating elements, an axle mounted on the elements and adapted to be positioned thereby, a tool carriage rotatively mounted on the axle and adapted to be swung on an are through the said opening and operatively held in any portion of the arc, a plurality of plungers operating and held in the carriage, aplurality of tools attached to the plungers and projecting therefrom for contacting surfaces to be roughened and keyed thereby, kick plates mounted securely on the plungers and coacting with each other, means for striking the kick plates and causing them to reciprocate with their plungers and tools, resilient means mounted on the tool carriage for tensioning the plungers and their tools, undercarriages for the frame for carrying the same and adjusting the tools on the surface to beroughened and keyed, and mechanism for operating the means for striking the kick plates, adapted to actuate all the plungers and tools simultaneously, said mechanism being mounted on the tool carriage, and connected with all the plunger-s, and means for keeping the tools out of contact with the said surface, when said mechanism is not operating. 7

THOMAS H. LARSEN. 

